99990239 has 2 divisors, whose sum is σ = 99990240. Its totient is φ = 99990238.

The previous prime is 99990181. The next prime is 99990263. The reversal of 99990239 is 93209999.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 99990239 - 2⁸ = 99989983 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99990299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49995119 + 49995120.

It is an arithmetic number, because the mean of its divisors is an integer number (49995120).

Almost surely, 2^99990239 is an apocalyptic number.

99990239 is a deficient number, since it is larger than the sum of its proper divisors (1).

99990239 is an equidigital number, since it uses as much as digits as its factorization.

99990239 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 354294, while the sum is 50.

The square root of 99990239 is about 9999.5119380898. The cubic root of 99990239 is about 464.1437806870.

The spelling of 99990239 in words is "ninety-nine million, nine hundred ninety thousand, two hundred thirty-nine".